We are announcing the status of major inspections and restoration works and
nonconformances at TEPCO's Kashiwazaki-Kariwa Nuclear Power Station after
the Niigata-Chuetsu-Oki Earthquake.
Inspection/Restoration Status
○ Inspection and restoration completed between June 13th to June 19th, 2008
(Completed on the following date)
• Unit No.1 Excitation transformers inspection (transportation into the factory):
June 17th
• Unit No.3 Stack inspection (inspection for substructure of piles):
June 10th*
• Unit No.6 Stack inspection (detailed inspection for top of stack):
June 16th
• Inspection of spent fuel transportation cask:
June 13th
○ Inspection and restoration to be commenced between June 20th to June 26th, 2008
(To be commenced on the following date)
• Unit No.2 Core shroud inspection:
June 24th
• Unit No.3 Turbine inspection (detailed inspection for high-pressure turbine and
low-pressure turbine (A)):
June 25th
• Unit No.3 Turbine inspection (restoration work for blades of low-pressure turbine
(A) and (B)):
June 25th
• Unit No.3 500kV power cable inspection (removal of cables):
June 23rd
• Unit No.3 Stack inspection (detailed inspection for top of stack):
June 16th*
• Unit No.5 Stack inspection (inspection for substructure of piles):
June 20th
• Unit No.7 Seismic reinforcement works such as pipe supports (reinforcement works
for pipes):
June 16th*
• On-site check, inspection and restoration of the oil protection bank for the
transformer (Unit No.1 preparation for restoration work):
June 23rd
• On-site check, inspection and restoration of the oil protection bank for the
transformer (Unit No.6 restoration work):
June 24th
• Construction of seismic-isolated essential buildings (site preparation work):
June 23rd
*Work schedules added this week.
○ Work Schedule of Major Inspection/Restoration from June 15th to July 12th, 2008
• Work Schedule of the Main Inspection/Restoration of the Kashiwazaki-Kariwa Nuclear
Power Station in Response to the Niigata-Chuetsu-Oki Earthquake (during 4 Weeks)
....Appendix
(Reference)
Nonconformances Found in the Inspection and Restoration Works Performed after the
Niigata-Chuetsu-Oki Earthquake
Based on the "Public Announcement Regarding Nonconformance Found in the Inspection
and Restoration Works Performed after the Niigata-Chuetsu-Oki Earthquake", the Tokyo
Electric Power Company, Incorporated (TEPCO) provides this announcement containing
incidents information reported from June 12th to June 18th, 2008.
○ Incidents Information (relating to the Chuetsu-Oki Earthquake)
 |
< Reports from June 12 to June 18, 2008 >
 |
○ Other Findings
• Unit No.7
Leak-rate test of the containment vessel was conducted from June 11th to June 12th
to confirm its leak-tightness. The test showed no abnormality.
• Unit No.6
Visual inspection was conducted for forks of 252 rotor blades on the 15th stage
and 260 rotor blades on the 16th stage of the low-pressure turbine (B) (15th stage:
126 blades each on generator-side and turbine-side; 16th stage: 130 blades each on
generator-side and turbine-side). As a result, no damage was found. Additionally,
non-destructive investigation resulted in an indication on the fork of a rotor blade
on the turbine-side of 16th stage. Indication was not found on generator-side and
turbine-side of 15th stage and the generator-side of 16th stage.
• Unit No.7
Visual inspection was conducted for forks of 260 rotor blades on the 16th stage of
the low-pressure turbine (C) (130 blades each on generator-side and turbine-side).
As a result, no damage was found. Additionally, non-destructive investigation
resulted in indications on the forks of 31 rotor blades on the generator-side and
9 rotor blades on the turbine-side.
Appendix: Work Schedule of the Main Inspection/Restoration of the Kashiwazaki-Kariwa Nuclear
Power Station in Response to the Niigata-Chuetsu-Oki Earthquake (during 4 Weeks)
(PDF 96.4KB)
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